Skiving machine



SKIVING MACHINE 2 Sheets-Sheet 1 ,:1 Filed Sept. 2, 1939 INVENTOR BY JOSEPHEREMINGTON ATTORNEY NOV. 12, 1940. REMINGTON 2,221,436

SKIVING MACHINE Filed Sept. 2, 1939 2 Sheets-Sheet 2 INVENTOR JOSEPHEREMWGTON BY H 3 ATTORNEY Patented Nov. 12,1940

UNITED STATES ATENT OFFiCE This invention relates to skiving machines, and in particular relates to apparatus for making skived pieces, such as footwear inserts, from sponge rubber, rubber, leather or like material.

An object of the invention is to provide a simple, efficient machine for making skived pieces for footwear inserts, or the like from sponge rubber, or similar materials, at a minimum cost of production. a i

Another object of the invention is to provide in a skiving machine 'improvedmeans for effectively retaining the material the skiving operation.

Another object of the invention is to provide a skiving machine of the character described in which the blanks, from which the skived pieces are made, may be fed into the machine and the finished pieces removed therefrom in substantially rapid succession.

These and other objects of the invention will be manifest from the following brief description and the accompanying drawings.

Of the accompanying drawings:

Figure 1 is a front view, partly broken away, of the apparatus embodying the invention.

Figure 2 is a. plan view thereof.

Figure 3 is a cross-section, taken substantially on line 33 of Figure 2, illustrating the manner in which the blanks are held in the matrix.

Figure 4 is a view, similar to Figure 3, illustrating the skiving operation.

Figure 5 is an edge view of a footwear insert produced by the apparatus.

Referring to the drawings, mounted on a table 35 may be a base plate I I having secured thereto an upwardly extending shaft l2, and suitably journalled on the latter may be a tool support I3 having integral therewith a horizontally extending arm 14. Suitably secured for longitu- 40 dinal adjustment on the free-end of arm 14,

may be a bearing for a vertically extending shaft l6, on the lower end of which is fixed a skiving tool I1, preferably a disc knife of known type, adapted to cut substantially in a horizontal 45 plane. A pin ll? fixed in plate Il may have an adjustable screw ll therein for engaging flange l3 on support 13, to limit forward swinging movement of said support, as shown in chaindotted lines in Figure 2.

For guarding the machine operator against accidental injury by knife I1, a casing 18, comprising a circular top plate l9 having an annular flange 2|] extending downwardly therefrom, may be secured to the bottom of bearing 15. The 55 front side of flange has an opening 20 therein,

to be skived for preferably just large enough for receiving the upper portion of a work-holding device, indicated generally at 2|, when knife I1 is swung in an are about shaft I 2, said device being located forwardly of knife 11 in the normal inoperative position of the latter.

For driving the shaft 16 to rotate knife H, a V-belt 22 may connect between a pulley 23, fixed on the upper end of shaft l6, and a similar pulley 24 of an electric motor. 25 suitably mounted on the pivoted support l3.

The holding device 2| may comprise a-block 26 having a nipple 26 threaded therein to communicate with a recess21 in the top face of said block. This nipple extends downwardly through an opening in plate II, and is vertically adjustably secured to plate H by means of nuts 28, 28, threaded onthe nipple, for engagement with opposite sides of the plate. Removably secured against the top face of block 26 may be a matrix or die 29 having a cavity 30 on the upper face thereof of substantially the shape and depth of the article or skived piece to be formed therein, as will subsequently be described. By means of the nuts 28, the height of holding device 2| may be vertically adjusted so that the top face of matrix 23 is substantially in the same plane with bottom face of the disc knife IT, with clearance as desired. Between the matrix 29 and block 26 may be a suitable gasket 3| of rubber, sponge rubber, or the like. Matrix 29 is provided with a plurality of openings 32, 32 to communicate the cavity 30 with the suction chamber provided by recess 21 in block 26.

Interiorly threaded in the lower end of nipple 26 may be a pipe 33 which connects the chamber 21 with the interior of a suction pump 34 adjacent the top thereof. The lower'end of a piston. rod 35 of a piston 36, reciprocally received in a cylinder 34* in pump 34, may be pivotally connected to a suitable foot treadle 31 pivoted on a cross-bar 38 at the rear of table [0. A tension spring 39, connected between treadle 31 and the top board of table 10, normally causes piston 36 to be yieldably urged upwardly in cylinder 34*. The arrangement is such that an operator, by applying foot-pressure on top of treadle 31, against the yielding action of spring 39, applies suction to the cavity 30 of matrix 29.

In order to eliminate tendency of disc type knives to break the suction holding blanks B in matrix cavity 30 when the blank is being skived, knife 19 should be relatively thin. This makes it impractical, in securing the knife to shaft l6, to countersink the lower face of the knife for receiving a flat-headed screw. In the present construction the knife I! may be secured against a shoulder on shaft l6 by means of a relatively thin-headed screw 4| threaded into the end of the shaft. The bearing I5 is then adjusted angularly in supporting arm M1, by means of adjusting screw M to set the knife at an angle to the horizontal just sufficient that the head of screw 4| will barely clear the top face of matrix 29 as the knife is swung past it. This may be accomplished so that the knife will be so substantially in a horizontal plane as not to apply an upward pull on blank B to break the suction effect holding it in matrix 29, and so that the skived surface of the piece P will be substantially flat while it is still held in cavity 30 by suction.

In the operation of the apparatus motor 25 is driven continuously to rotate shaft l6 carrying disc knife ll. An operator, stationed in front of the machine, first places a blank B of desired thickness and shape over the cavity 30 of matrix 29, the blanks preferably being precut from uitable material such as sponge rubber, rubber, leather or the like, and placed in stacks within convenient reach of the operator. Simultaneously with placement of a blank on the matrix 29, the operator yieldingly presses the treadle 31, to draw the blank B into cavity 3|] by suction (see Figure 3), while with his free hand upon handle 33 he swings support [3, and the parts carried thereby, from the full line to the chain-dotted positions thereof shown in Figure 2. This movement of rotating knife I! cuts or skives that portion of blank B which projects above the top face of matrix 29 from the portion drawn into cavity 30 by suction, thereby leaving skived piece P in the cavity as bracket I3 is swung back to the full-line position thereof (Figure 2). As the knife I! is moved away from the matrix 29, the operator releases his foot from treadle 31 to release the suction effect from the s-kived piece P. The inherent tendency of the piece to resume its normal shape causes it to become convex on top and flat on the bottom,

as shown in Figure 5, which facilitates removal of the piece from matrix 29 to replace it with another blank 13.

Thus it readily is seen that an operator, operating the suction means with his footwhile using one hand to swing the knife to-and-fro past the face of the top matrix 29, may replace the finished skived pieces with blanks in substantially rapid succession. The flanges 20 of knife I! and guard I8 substantially eliminate danger of the operators hands being accidentally cut by the knife I! as it is swung toward the matrix 29. 1

Modifications of the invention may be resorted to without departing from the spirit thereof or the scope of the appended claim.

What is claimed is:

A machine of the character described comprising a fixed matrix, means for applying suction to said fixed matrix to hold a blank therein, a member 'shiftably mounted in association with said matrix, a disc cutter rotatably mounted on said member, and means on said member for rotating said cutter, said member being shiftable on its mounting to move said disc cutter toward and from said matrix substantially in a plane with the top face of the matrix for skiving the blank held in the-matrix.

JOSEPH F. REMINGTON. 

